EXPANDING COLLETS
5c expanding collet with 16c, 2j, and 3j expanding collets available 16c expanding collet with 5c, 3j, and 2j expanding collets available
2j, 3j, 16c and 5c Expanding Collet
Features and Benefits
Dunham Tool manufactures high quality 5c expanding collets, 2j expanding collets, 16c expanding collets, 3j expanding collets and other special sizes with diameter capacities of 1 1/4" to 6" and expandable lengths from 1" to 3". These expanding collets, patented in 1958, are machinable by the customer. The Dunham Tool expanding collet is designed for use with standard air collet or hydraulic cylinders or other collet fixtures. Expanding collets hold on the inside diameters or inside dimensions of workpieces.

The Dunham Tool collet provides an expanding member to locate and hold work from the inside, using your present 5c, 16c and 3j equipment - lathes, milling machines, grinders, fixtures, etc. with no extra attachments. Accuracy within .0005 is not unusual on concentricity and the expanding collet enables you to hold close shoulder tolerances.

 

  • Requires no special adapters
  • Rigid one piece body / mandrel construction
  • Actuated by machine draw tube or collet fixture
  • Available from 1/4 to 6 diameter
  • Available from 1 to 3 expandable length
  • Machinable by customer to desired diameter
  • No draw back gives positive end length
  • Special expanding collet configurations available
  • Internal collet chucking
  • Economical and accurate

 

Visit our online catalog to view the complete Dunham Tool line of machine tool products.

How is our expanding collet used?

The Dunham Tool expanding collet is inserted into the spindle of your machine and it's threaded draw bar until the 5c or 16c taper seats. The conventional movement of the draw bar will expand and release the soft slotted member.

The soft mandrel may be machined to fit any I.D. within the range of the collet, i.e. from 1/4" to 6".

The solid taper on the collet, once seated, will not draw back into the spindle. Thus a machined shoulder will hold the width dimensions within .001". The Dunham Tool expanding collet may be removed and replaced in a machine without affecting its accuracy as with any standard collet. If accuracy to within .0005" is desired, a slight truing cut will suffice. The expanding collet can operate with the spindle moving.

Dunham Tool expanding collets may be transferred to any machine using standard 5c collets. Therefore, it may be switched from machine to machine for use in turning, grinding, machining, drilling, milling, etc., saving valuable time.

Construction Diagram for 5C Expanding Collet
Construction Diagram for 5C Expanding Collet
Product Drawings for Expanding Collet
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Model Number and Description 5C Expanding Collet
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Standard Expanding Collet Sizes
5C Expanding Collet
16C Expanding Collet
3J Expanding Collet
Unmachined Diameter A
Machinable Diameter Range
Mandrel Length B
CC 410
 
 
1/2"
.250 - .468
1"
CC 710
 
 
13/16
.437 - .800
1
 
CC 1510*
16C1510
CC3J1510
1 1/2
.750 - 1.437
1
CC 1515
 
 
1 1/2
.750 - 1.437
1 1/2
CC 1520*
16C1520
CC3J1520
1 1/2
.750 - 1.437
2
CC 1525
 
 
1 1/2
.750 - 1.437
2 1/2
CC 1530*
16C1530
CC3J1530
1 1/2
.750 - 1.437
3
 
CC 2010*
16C2010
CC3J2010
2
.750 - 1.937
1
CC 2015
 
 
2
.750 - 1.937
1 1/2
CC 2020*
16C2020
CC3J2020
2
.750 - 1.937
2
CC 2025
 
 
2
.750 - 1.937
2 1/2
CC 2030*
16C2030
CC3J2030
2
.750 - 1.937
3
 
CC 2510
 
 
2 1/2
.750 - 2.437
1
CC 2515
 
 
2 1/2
.750 - 2.437
1 1/2
CC 2520
 
 
2 1/2
.750 - 2.437
2
CC 2525
 
 
2 1/2
.750 - 2.437
2 1/2
CC 2530
 
 
2 1/2
.750 - 2.437
3
 
CC 3010*
16C3010
CC3J3010
3
.750 - 2.937
1
CC 3015
 
 
3
.750 - 2.937
1 1/2
CC 3020*
16C3020
CC3J3020
3
.750 - 2.937
2
CC 3025
 
 
3
.750 - 2.937
2 1/2
CC 3030*
16C3030
CC3J3030
3
.750 - 2.937
3
 
CC 3710
 
 
3 3/4
.750 - 3.687
1
CC 3715
 
 
3 3/4
.750 - 3.687
1 1/2
CC 3720
 
 
3 3/4
.750 - 3.687
2
CC 3725
 
 
3 3/4
.750 - 3.687
2 1/2
CC 3730
 
 
3 3/4
.750 - 3.687
3
 
CC 5020
 
 
5
.750 - 4.937
2
CC 6020
 
 
6
.750 - 5.937
2
 
* Also available in 2J, 16C, and 3J expanding collet sizes
 


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